In this quiz, I needed to create a circuit that acts like a 7420 chip. This is a digital chip. I used logical operations here, as I was dealing with only one bit for each input signal.
Here is my code for this quiz.
module top_module (
input p1a, p1b, p1c, p1d,
output p1y,
input p2a, p2b, p2c, p2d,
output p2y );
assign p1y = !(p1a&&p1b&&p1c&&p1d);
assign p2y = !(p2a&&p2b&&p2c&&p2d);
endmodule
Reference : https://hdlbits.01xz.net/wiki/7420